The M3 has also a (exhaust) drone, 70km/h 5th gear, 2K RPM.........it`s droning very strong......only sollution; put it in 3th-4th or 6th gear.......rather 3th or 4th, this is an engine that loves to rev, and revs it has to make to run smoother, better, it`s just the nature of the game.........